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@adroit
I assume the top race went on OK before the lock nut? probably the locknut threads if it did.
Have a close look at the threads on both the steerer and the locknut.
It is possible to see if the threads are worn:- the top of each thread should be sharp, if flat they are worn.
A worn lock nut is easy, get a new one, worn steerer is a problem, because it is very difficult to repair the threads.
What you can do though is to use loctite on the top race to hold it in place, and then you won't need the lock nut. I did this as a short term bodge on a bike about 5 years ago, and it still works fine!